What about having Symbol.equals?
For example, for now this is what it does:
```js
class Position {
constructor(o) {
this.x = o.x instanceof Number ? o.x : 0
this.y = o.y instanceof Number ? o.y : 0
this.z = o.z instanceof Number ? o.z : 0
}
}
console.log(new Position({x: 10, y: 10, z: 10}) === new Position({x: 10, y: 10,
z: 10})
```
Output is of course, false.
With `Symbol.equals`, we could make it easier, instead of
`instance.equals(otherInstance)`.
For example:
```js
class Position {
[Symbol.equals](oIn) {
return oIn.x === this.x && oIn.y === this.y && oIn.z === this.z
}
constructor(o) {
this.x = o.x instanceof Number ? o.x : 0
this.y = o.y instanceof Number ? o.y : 0
this.z = o.z instanceof Number ? o.z : 0
}
}
console.log(new Position({x: 10, y: 10, z: 10}) === new Position({x: 10, y: 10,
z: 10})
```
Now output would be true.
This would save most of the time, instead of writing .equals and then
surrounding everything with ().
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